Research And Design Of 140GHz Magnetron Injection Electron Gun

The gyrotron is a kind of vacuum electronic device.Due to its high power and high efficiency in the high frequency band,it has been concerned and studied by relevant international and domestic research institutions.At present,the gyrotron has been widely used in ion heating and diagnosis,DNP-NMR spectroscopy,material processing,radar communication,safety and other fields.With the rapid development of the gyrotron,its output power is also getting higher and higher,which undoubtedly is a greater challenge to the design of the various components of the gyrotron.As one of the key components of the gyrotron,the electron gun can provide an electron beam with sufficient transverse energy for the gyrotron,and the quality of the electron beam is important for the performance of the whole tube,according to the requirement of the high-frequency interaction cavity for the parameters of the electron beam,the electron beam at the entrance of the interaction cavity should have a proper velocity ratio,a proper guiding center radius,and a small velocity spread.In addition,for an electron gun to emit electrons normally,the temperature of the cathode emission band needs to reach the electron emission temperature.The temperature is provided by a filaments of a certain power.The temperature field distribution and deformation field distribution of the electron gun after heating will most likely affect the performance of the electron beam which is emitted by the electron gun.For high output power gyrotron,if its temperature is too high,it is likely to have a serious impact on the stability and life of the gyrotron.In order to make the filaments heat transfer more efficiently,and to ensure the performance of electron beam unaffected,we need to optimize the power,number and position of the filaments.So,thermal analysis of the electron gun is also a very important part of the gyrotron design.The contents work of this article is as follows:1,The basic theory of magnetron injection electron gun(MIG)of gyrotron is introduced.And the principle and design method of MIG are analyzed and studied in detail based on the MIG of gyrotron theory.2,The 2D and 3D simulation analysis of the MIG was carried out by using two particle simulation software.Based on relevant theory and simulation results of MIG,the MIG optimization method was studied in detail,and a 140 GHz gyrotron MIG that meets performance requirements was designed.3,The temperature distribution and thermal deformation distribution of the MIG were analyzed by thermal analysis simulation software,and based on the analytical results,the structure of MIG was optimized to meet the relevant requirements of the MIG,the simulation results show that under the optimized filament heating power,the thermal deformation of the MIG key position will not have a big impact on the MIG parameters.Finally,the thermal analysis of MIG was done using different thermal analysis simulation software,and the thermal analysis results which obtained by the two kinds of software was compared,the simulation results of the two kinds of simulation software are consistent.